It would seem to be that since your collection is passed by value there's
not much you can do to make the second scenario return true. Also, If I
remember correctly you may have to change your delay updates until end of
transaction (Weblogic) in conjunction with your isolation level so that any
changes are seen. This was with 1.1.
--tinou
----- Original Message -----
From: "Richard Monson-Haefel" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Monday, May 14, 2001 11:47 AM
Subject: [EJB-INT] EJB 2.0: Bi-Directional Relationships
> Bi-directional relationships create some interesting situations, when
> concerned with establishing relationships between two participants. The
> following scenario illustrates a problem that I would like vendors to
> comment on, if they are up for the challenge.
>
> Assume that SalesRep has a one-to-many bidirectional relationship with
> Customer.
>
> ------------------
>
> SalesRep rep = SalesRepHome.findByPrimaryKey(somekey);
>
> Customer cust = CustomerHome.create( );
>
> cust.setSalesRep( rep);
>
> Colleciton colleciton = rep.getCustomers( );
>
> if(collection.contains( cust ))
> flag = true;
> else
> flag = false;
>
> -------------------
>
> What is the value of flag? I suspect it should be true in this
> scenario.
>
> However, what would happen if the Colleciton of Customer references was
> obtained before cust set rep in its salesRep relationship field?
>
> --------------------
>
> SalesRep rep = SalesRepHome.findByPrimaryKey(somekey);
>
> Colleciton colleciton = rep.getCustomers( );
>
> Customer cust = CustomerHome.create( );
>
> cust.setSalesRep( rep);
>
> if(collection.contains( cust ))
> flag = true;
> else
> flag = false;
>
> -------------------------
>
> In this case the flag should still be true, IMO, but it may not for some
> containers. The specification warns against modifying a Collection
> based relationship field when perusing a Interator of that Collection,
> but it doesn't, to my knowledge, address this situation.
>
> Comments?
>
> Richard
>
> --
> Richard Monson-Haefel
> Author of Enterprise JavaBeans, 2nd Edition (O'Reilly 2000)
> Co-Author of Java Message Service (O'Reilly 2000)
> http://www.jMiddleware.com
>
>
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>
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